Safety-valve



2 Sheets-Sheet 1.

(N0 ModelJ W. S. JARBOE.

SAFETY VALVE,

No. 312,724. Patented Feb. 24.1885.

Lilhngnphnv. Washington, n c.

(No Model.) 2 Sheets-Sheet 2.

W. S. JARBOE.

SAFETY VALVE.

.No. 312,724. Patented Feb. 24, 1885.

IHFLTLESSER I I IILVEIGUI lhvrTEn STATES PATENT FFlCE;

WALTER S. JARBOE, OE ALLEGHENY CITY, ASSIGNOR TO BAILEY, FARRELL & 00., OF PITTSBURG, PENNSYLVANIA.

SA FETY-VALVE.

SPECIFICATEOI" forming part of Letters Patent No. 312,724, dated February 2%, 1885.

Application filed August 9, 1884. (No molleLl T aZZ whom it may concern:

Be it known that I, WALTER S. JARBoE, of the city of Allegheny, in the county of Allegheny and State of Pennsylvania, have in- 5 vented a new and useful Improvement in Safety-Valves; and I do hereby declare the following to be a full, clear, and exact description thereof, reference being had to the accompanying drawings, forming part of this specifilo cation, in which Figure 1 is a vertical sectional view of my improved automatic valve, and Fig. 2 is a like view of a modification thereof.

Like letters of reference indicate like parts wherever they occur.

My invention relates particularly to natural gas,which differs in many'respects from gas produced from coal and othenfuel, among which differences are that it is without perceptible 2o odor,is more penetrating, and is delivered from the well under high pressure, which often causes leaks in the supply-pipe, and the flow of gas from the well is also more or less intermittent. From these causes the flow through the supply- 2 5 pipe is now and then interrupted, which causes the flame at the burner to die out, allowing the gas, which is not only noxious, but highly explosive when mingled with the atmosphere, to escape unperceived into the building where the gas is employed. Serious accidents have in this manner taken place; and to obviate this danger, and to prevent the escape of the gas in the manner described, is the object of my invention. To accomplish this end I em- 3 5 ploy a valve situate in the supply-pipe, which closes automatically whenever the pressure of the flow of gas in the pipe is interrupted to such an extent as to cause the flame at the burner to be extinguished, thereby shutting 40 off the supply ofgas, so as to prevent it passing to the burners when the pressure returns.

I will now describe my invention, so that others skilled in the art may employ the same.

In the drawings, a represents a globe-valve 5 having a tubular plug, 1), in the upper socket thereof, secured by screw-threads.

Extending into the cavity 1) of the tube b is the valve-stem c, which fits loosely therein. This stem 0 extends from the valve d, which has a cup-shaped upper surface, the rim of valve-seat.

which seats closely against an annular ring of packing, f, situate in a suitable recess or cav ity in the bottom of the plug 1) when the valve is open, so as to prevent the gas from passing from the valve-chamber a through the cavity b.

Situate in a suitable recess in the bottom face of the valve (1 is an annular ring of packtubular opening, e, into whichpasses the valve stem 6, extending from the lower face of the valve d downward.

Secured by suitable screw-threads to the lower portion of the casting a, formingthe valve-chamber a, is a striding-box, f through which a sliding rod, f, extends upward into the cavity 0.

In the lower end of the rod f is a vertical slot, f, through which a lever-arm, h, passes, one end of which lever is pivoted to the bracket i, which is secured to the outer face of the casting a, the lever h passing thence through the slot in the rod f, and through a guide-slot, i, formed in a second arm of the bracket 2'.

On the free end of the lever h,at the desired point, is placed a suitable weight secured to the lever, so as to be readily moved thereon S 5 nearer to or away from the fulcrum. This weight is not shown in the drawings.

Extending downward through a suitable stutfing-boxflc, into the tubular cavity Z1, above the valve-stem c, is a rod, m, having a tubuo lar cavity, m, extending longitudinally from the lower end of the rod to the point mflwhere it branches horizontally and extends through the outer suface of the side of the rod.

In the upper end of the rod m, outside of 5. the stufling box 7c, is a longitudinal slot, at, through which a lever'arm, it, passes. This lever is pivoted to the bracket a", which is similar to the bracket '5, and is secured to the upper end of plug b in like manner. The two :00

levers 7L a are connected by the vertical rod 1, the levers being pivoted in longitudinal slots formed in the ends of the rod. It will be noticed that the space between the rod f and the valve-stem e in the cavity eis greater than the space between the lower face of the valve (Z and the valve-seat (o The operation of these devices is as follows: The gas-supply pipe being secured to the socketp of the valve and the service-pipe at the socket q, the valve is opened by raising the lever-arm 71, thereby lifting the rod f until the end thereof comes into contact with the lower end of the valvestem e and pushes it upward, thereby unseating the valve (1 from the lower seat, a, and seating it against the upper seat, f. At the same time the lever-arm it rises with the arm 71, raising the rod an until the opening of the cavity m is above the stuffing'box 7t, so that the gas contained in the upper part of the Ivalve-chamber above the valve may pass around the valve-stem and through the cavity m away from the valve. \Vhen the valve is opened in the manner described, the gas passes through the valvechamber a, below the valve (1, and by its pressure keeps the valve closely seated against the seat f, resisting the force of the weight on the lever h pressing against the rod m, which bears on the end of the valve-stem. 0, the gas passing from the valve-chamber into the service-pipe. W'hen, however, the pressure of the gas in the valve-chamber a is reduced so low as to cease to supply gas to the burners, the force of the'weight on the lever h, being exerted on the valve-stem c, closes the valve (1. At the same time the rod at being lowered in the cavity 2), the opening m is brought below the stuffing-box 7a, and the gas,bein g prevented from escaping from the valve-chamber, adds its pressure to the valve, keeping it closed until the valve is again lifted by the lever h. The purpose of the space between the end of the valve-stem e and the rod f is to enable thevalve-stem to descend its full length without coming in contact with the rod f. This valve, as I have described it, is adapted for use when the gas is fed into the service-pipe at high pressure. \Vhere, however, the gas is fed at a low pressure, I prefer to employ the modification shown in Fig. 2, in which a light spring, 0', is arranged around the rod 112, which rod is provided with a conical valve, 8, seating in the tubular cavity Z), and is without the cavity m, the'rod fitting loosely in the cavity Z). This spring should have a sufiicient force to overcome the pressure of the gas on the end of the rod m, but not sufficiently strong to overcome the pressure of the gas on the valve d, which presents amuch larger surface. It will also be noticed that the upper and lower faces of the valve (Z are cup-shaped, the packing being placed in annular recesses in bot-h valve-seats. In this form of valve the purpose of the lever h is merely to open the valve in the manner already described, and when the valve has been opened it drops to its normal position,

(shown in the drawings) the valve, however, being held open by the pressure of the gas on the lower side of the valve. hen the valve is opened,the rod m and valves are raised, allowing the gas to pass out of the upper portion of the valve chamber, and the valve is held in this position by the pressure of the gas. hen, however, the pressure is weakened or interrupted by a leak in the pipe or other cause, the valve is closed by the pressure of the spring r, and remains closed until the lever h is again raised.

I am aware that automatic extinguishers for shutting off the flow of gas by lessening the pressure in the main have been used before, and I therefore do not desire to claim the same broadly.

Having thus described my improvement, what I claim as my invention, and desire to secure by Letters Patent, is

1. In an automatic safety-valve for shutting off the flow of gas, the combination ofa valvechamber and a puppetvalve, arranged, substantially as described, that the pressure of the gas shall be exerted to retain the valve away from the seat or port leading to the service-pipe when the valve is open, and shall retain the valve against the seat or port when the valve is shut, as and for thepurpose specified.

2. In an automatic safety-valve for shutting off the fiow of gas, the combination ofa valvechamber and a puppet valve, arranged, sub stantially as described, that the pressure of the gas shall be exerted to retain the valve away from the seat or port leading to the service-pipe when the valve is open, and shall re tain the valve against the seat or port when the valve is shut, a weight or spring for 010s ing the valve when the pressure of gas is less ened, and a rod or lever for opening the valve by external pressure, substantially as and for the purpose specified.

3. In an automatic safety-valve for shutting off the flow of gas, the combination of avalvechamber having a portleading to the servicepipe and an'exit for confined gas, a doubleseated valve arranged within the chamber, substantially as described, to open and close the exitwhen the port is opened, as and for the purpose specified.

4. In an automatic safety-valve for shutting off the flow of gas, the combination of a valvechamber having a port leading to the servicepipe and an exit for confined gas, a doubleseated valve arranged, substantially as described, to open and close the exit when the port is opened, and a valve for closing the exit when the portis shut, substantially as and for the purposespecified.

In testimony whereof I have hereunto set my hand.

\VALTER S. JARBOE.

\Vitnesses:

J os. H. JACOBS, THOMAS XV. BAKEWELL. 

